Which stage of COIN concerns itself with expansion of stability operations across contested regions?

The stage of Counterinsurgency (COIN) that focuses on the expansion of stability operations across contested regions is typically referred to as the "Stabilization" phase. In this stage, efforts are made to establish security, rebuild infrastructure, and foster governance to mitigate the influence of insurgent groups. The goal is to create a sustainable environment where local populations can support the government and reject insurgency.